Incandescent electric lamp



(No Model.)

W. NIGKERSON. INGANDESGENT'ELBGTRIG LAMP.

No. 500,070. Patented June 20, 1003.

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UNITED STATES PATENT ()FFIGE.

WVILLIAM EMERY NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

INCANDESCIENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 500,079, dated June 20, 1893. Application filed April '7, 1893. Serial No. 469,403- (No model.)

To all whom it may concern:

, Be it known that I, VILLIAM EMERY N IOK- ERSON, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Incandescent Electric Lamps, of which the following, taken in connection with the accompanying drawing, is a specification.

My invention relates to incandescent elec-" tric lamps of that class in which the globe of the lamp is not of continuous glass, but in which the neck of the lamp is closed and the leadinginwires supported by a plug of fusible cement. It consists in a novel method of preventing the leading-in wires from convey- M is the globe of an incandescent electriclamp provided in the neck with the shoulder N, adapted to support a disk 0 of mica or other suitable substance. The disk Oserves as a support for the leading-in wiresP P during the process of manufacture and also as a floor upon which the cement R is the melted state.

S is the filament of the lamp attached at T poured in T to the leading-in wires. The leading-in wires are flattened into the form of a ribbon from a point near their union with the filament to a point near the disk 0. The object of this flattening is to largely increase the radiating surface of the wires without increasing their ability to convey heat by conduction. By this large increase of radiating surface much of the heat which would otherwise be conveyed to the cement plug by the wires is dispersed by radiation and a lower temperature is maintained in the cement plug than if the wires were of circular cross section throughout their length.

I claim In an incandescent electric lamp the combination of the glass globe M disk 0 cement plug R. and filamentS with the leading-in IVILLIAM EMERY N ICKERSON.

Witnesses:

FRANK G. PARKER, FRANK G. HATTIE.

wires P P, said wires being flattened as de- 

